How to make a box-shadow inset with a transparency?

I'm interested in learning how to create a css3 box-shadow inset with a transparency.

See the input in the fiddle here: htt开发者_StackOverflow中文版p://jsfiddle.net/TeGkt/4/

For the input's background image. How can you create that effect without needing an image?

Thanks

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Yes, using CSS3 styles: http://jsfiddle.net/arnorhs/Nz7KG/

Will not work in IE pre ie9

And I didn't add any of -moz or -webkit- prefixes for compatibility..

I also didn't do it 100% the same. Your question seemed to be towards if it's possible or not...

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rgba(255,255,255,0.75)

where rgba(r,g,b,a) is red green blue alpha